Masana Yamada

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Sevoflurane can induce prolongation of the cardiac QT interval by inhibiting the repolarization phase of the action potential. This may occur as a result of inhibition of the human ether-a-go-go related gene (HERG) channel. To clarify the mechanisms of anesthetics on HERG channels, we monitored the electrocardiogram and measured QT intervals in the guinea(More)
BACKGROUND Sevoflurane causes QT interval prolongation clinically, but its precise mechanism has not been clarified. We examined the mechanism of QT interval prolongation induced by sevoflurane by means of electrophysiological technique in guinea-pig ventricular myocyte. METHODS Electrocardiogram was recorded in guinea-pig and effect of sevoflurane (1, 2,(More)
A 71-year-old female developed upper airway obstruction due to flexed cervical position after posterior occipito-cervical fusion. After the operation, she was re-intubated with the air-Q intubating laryngeal airway. Revision surgery allowing the angle to return to the neutral position was performed to attenuate the overflexion of the cervical position.(More)
Purpose. This study was undertaken to assess the effects of ropivacaine on the membrane action potential and the voltage-dependent L-type calcium channel current (I Ca) in guinea-pig single ventricular myocytes. Methods. Single ventricular myocytes were prepared by enzymatic dispersion. Whole-cell current and voltage-clamp techniques were used to monitor(More)
Comparison of the calculation formula, reproducibility, correlation and variation of bicarbonate ion concentration (HCO3 −), and base excess value (BE) among four blood-gas analyzers was performed. No HCO3 − and BE values calculated from the formulas showed any clinically significant difference, and all analyzers showed good correlation on their(More)
In order to investigate whether dementia modifies the anesthetic actions in the central nervous systems, we have studied effects of general anesthetics on the hippocampal synaptic transmission using the dementia model mice. Preliminary in vivo experiments revealed that time of loss of righting reflex following sevoflurane inhalation was more shortened in(More)
BACKGROUND Continuous infusion of fentanyl for postoperative pain management is performed commonly. But the usage of traditional syringe pump or infusion pump sometimes makes medical staff confusing for its difficulties of handling. We have simplified the postoperative pain management system using the single-use continuous infusion device and the protocol(More)
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